Composite board.



E. C. ROBERTS.

comrbsnrn BOARD.

APPLIGATION FILED MAB. 5, 1910.

1,063,736, Patented June 3, 191::

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EDWARD G. ROBERTS, OF SALTVILLE, VIRGINIA.

COMPOSITE Benin).

Specification of Letters Patent.

Application filed March 5, 1910. Serial No. 547,588.

Patented J une3, 191 3.

To all whom it may concern;

Be it known that I, EDWARD C. Itonnn'rs, a citizen of the United States.resident of Salt-ville. in the county of Smyt-h and State of Virginia,have made a certain ne and useful Invention in Composite Boards; and Ideclare the following to be a full. clear, and exact description of thesame. such as will enable others skilled in the artto which itappertains to make and use the'invention, reference being had to theaccompanying drawings. and to letters or figures of reference markedthereon, whichform a part of this specification.

Figure 1 is a face View of the invention. Fig. 2 is an edge view of thesame.- Fig. 3 is a section through the perforations on a larger scale.Fig. 4 is a fragmentary view showing slots instead of circularperforations.

The invention relates to improvements in composite boards, designed foruse in place of builders laths in plastering the walls and ceilings ofdwelling or other houses or wherever laths are used for plastering orcementing thereover, and it consists in the novel construction andcombinations of parts, as hereinafter set forth.

In the accompanying drawings illustrating the invention, the letter adesignates my composite board. which is made up of three layers ofmaterial of the same superficial area cemented solidly together, themiddle lay-er I). being of pulp board'or wood veneer preferably, and theouter layers c and (Z being preferably thin wood veneers, ,orparchmentized paper may be substituted therefor. The middle or bodylayer is preferably about four times as thick as the outer layers thegrain of the wood of the veneer strips preferably crossing at rightangles. In cementing the three layers together, a "-.\'ater-proof cementis employed, as for instance coal tar heated to the boiling point, andone part in eight of calcium oXid added thereto, reducing the hydrogenof the coal. tar. rendering the cement chemically neutral and causing itto set very hard, the cement being applied'while boiling hot, and limpidor thin, the cement permeat ng the layers and the three layers beingplaced under heavy pressure of 'suitable fiat clamping surfaces (notshown). After the three layers of the board are suitably cementedtogether. I perforate the same in a regular manner throughout. as shownat c, e, the plaster. stucco, or other material used to finish the wallsflowing through the perforations in application. and being bound orclenched in place. with a thick tenacious water-proof chemically-neutralcement such as animal gelatin dissolved in water, with a proportion ofpotassium chromate added. Vhile this superficial coating is yet soft andbefore it has set, a layer of clean sharp sand is sifted t-hereover andfirmly pressed into the cement coating below the surface thereof betweenclamping rollers (not shown). When the cement is dry, the sand is a partof the board, which is now ready for nailing in place to the frameworkof the building or wall. The rough surface given the board by the sandcoating enables the cement or stucco to better adhere thereto. I may useeither of the water-proof cements described,

or in fact any suitable water-proof cement for both. cementing thelayers together and superficially coating the same to bind the sand,instead of using two different. cements.

My composite boards are very thin and may be edge lapped in application,whereby both nails and time are saved.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent is l. A composite board, consisting of Woodenveneer layers having a hard waterproof homogeneous chemically-neutralcement connection between and permeating the same, and an exteriorcoating of thick hard homogeneous chemically-neutral waterproof cement,said coating having fine sand embedded below the surface thereof in adistributed manner.

homogeneous chemically-neutral coal tar ce- I then coat the boardsuperficially,

r mentconnection between and permeating I In testimony whereof I afiixmy signature, 1 the same, and an exterior coating of thick in presenceof two witnesses.

hard chemically-neutral waterpgoof gelatin cement having potassiumchromate as EDWARD ROBERTS 5 an ingredient, said coating having finesand Witnesses:

embedded below the surface thereof in a CHAs. A. WILEY,

distributed manner. R. M. SHANNON.

